MAX2871 Datasheet, PDF (1/28 Pages) Maxim Integrated Products – Low Normalized Inband Phase Noise of -230dBc/Hz

MAX2871
EVALUATION KIT AVAILABLE
23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO
General Description
The MAX2871 is an ultra-wideband phase-locked loop (PLL)
with integrated voltage control oscillators (VCOs) capable
of operating in both integer-N and fractional-N modes.
When combined with an external reference oscillator and
loop filter, the MAX2871 is a high-performance frequency
synthesizer capable of synthesizing frequencies from
23.5MHz to 6.0GHz while maintaining superior phase
noise and spurious performance.
The ultra-wide frequency range is achieved with the
help of multiple integrated VCOs covering 3000MHz to
6000MHz, and output dividers ranging from 1 to 128. The
device also provides dual differential output drivers, which
can be independently programmed to deliver -1dBm to
+8dBm differential output power. Both outputs can be
muted by either software or hardware control.
The MAX2871 is controlled by a 3-wire serial interface and
is compatible with 1.8V control logic. The device is available
in a lead-free, RoHS-compliant, 5mm x 5mm, 32-pin TQFN
package, and operates over an extended -40°C to +85°C
temperature range.
The MAX2871 has an improved feature set and better overall
phase noise and is fully pin- and software- compatible with
the MAX2870.
Applications
●● Wireless Infrastructure
●● Test and Measurement
●● Clock Generation
●● Microwave Radios
Functional Diagram
Benefits and Features
●● Output Binary Buffers/Dividers Enable Extended
Frequency Range
• Divider Ratios of 1/2/4/8/16/32/64/128
• 23.5MHz to 6000MHz
●● High-Performance Phase Frequency Detector (PFD)
and Reference Frequency Reduces Spectral Noise
• PFD Up to 140MHz
• Reference Frequency Up to 210MHz
●● Low Normalized Inband Phase Noise of -230dBc/Hz
Reduces System Noise Floor Contribution
●● Manual/Automatic VCO Selection Permits Fast
Switching
●● Output Phase Reset and Adjustment Allow
Synchronization of Multiple Synthesizers
●● On-Chip Temperature Sensor with 7-Bit ADC Ensures
Optimum VCO Selection
●● Cycle Slip Reduction and Fast Lock Features
Improve Accuracy and Acquisition Time
●● VCO Lock Maintained Over Entire Temperature
Range Provides Glitch-Free Operation
●● Dual Differential Programmable Outputs Maximize
Flexibility of Use
Ordering Information and Typical Application Circuit
appears at end of data sheet.
MAX2871
REF_IN
CLK
DATA
LE
MUX R COUNTER
X2
SPI AND
REGISTERS
INTEGER
FRAC
MODULUS
DIVIDE-BY-2
MUX
VCO
DIV-BY-
1/ 2 /4 /8 /16
MAIN
MODULATOR
N COUNTER
MUX
MUX
LOCK DETECT
CHARGE
PUMP
DIV-BY-
1/ 2 /4 /8
MUX
MUX
LD
CP_OUT
GND_CP
TUNE
RFOUTA_P
RFOUTA_N
RFOUT_EN
RFOUTB_P
RFOUTB_N
19-7106; Rev 2; 5/16